1. What is an HVAC Tonnage Calculator?

Definition: This calculator determines the required air conditioning tonnage based on cooling capacity in BTU/hr.

Purpose: It helps homeowners and HVAC professionals properly size residential air conditioning systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — AC tonnage (tons)
• \( BTU \) — Cooling capacity (BTU per hour)

Explanation: One ton of cooling equals 12,000 BTU/hr. The formula converts BTU rating to standard tonnage units.

3. Importance of Proper Tonnage Calculation

Details: Correct sizing ensures energy efficiency, proper cooling, and system longevity. Oversized units short-cycle, while undersized units run constantly.

4. Using the Calculator

Tips: Enter the cooling capacity in BTU/hr (typically 12,000-60,000 BTU for residential systems). Value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my cooling capacity?
A: Check your current AC unit's specification plate or consult a Manual J load calculation for new installations.

Q2: What's the standard tonnage for homes?
A: Typical homes need 1 ton per 400-600 sq ft, but this varies by climate and insulation.

Q3: Why 12,000 BTU equals 1 ton?
A: Historically, 1 ton represents the cooling power of melting 1 ton of ice in 24 hours (12,000 BTU/24h = 12,000 BTU/hr).

Q4: Should I round up the calculated tonnage?
A: HVAC systems come in standard sizes (1.5, 2, 2.5, etc. tons). Round to nearest standard size, but consult an HVAC professional.

Q5: Does this account for climate differences?
A: No, this is a basic conversion. Hotter climates may require more capacity per square foot.